They are nearly 40 years apart in age, but they both love to play "Call of Duty: Ghosts," and in doing so have garnered a huge audience on relatively new social site Twitch. It has 45 million viewers worldwide every month, with more than a million people streaming their games. The site says the average viewer is 21 years old and watches 106 minutes per day. Lionsgate Films partnered with the site to tout the sci-fi movie “Ender’s Game.”